Ice-motor.



A. GRUB.

ICE MOTOR.

nrucuxon FILED IAN.12,1911.

Patented Feb. 6, 1912.

UNITEI) STATES PATENT OFFICE.

ALBERT GRUB, OF CHICAGO, ILLINOIS, ASSIGNOB OF ONE-FOURTH TO FREDERICKGRUB, OF CHICAGO, ILLINOIS.

ICE-MOTOR.

To all whom it may concern Be it known that I, ALBERT GRUB, a citizen ofthe United States, residing at Chicage, in the county of Cook and Stateof Illinois, have invented new and useful Improvements in Ice-Motors, ofwhich the following is a specification, reference being had to theaccompanying drawings, forming a part thereof.

The purpose of this invention is to provide means for propelling a sledover a roadway of ice or hard frozen snow crust.

It consists of the features and elements shown and described, asindicated in the claims.

In the drawings: Figure 1 is a top plan view of a sled fitted with thisdevice. Fig. 2 is a side elevation, being a section at the line 22 onFig. 1. Fig. 3 is a detail of a guide roller and track for the same.Fig. 4 is a detail elevation showing a transposed position of certainparts.

Briefly, this device consists of a driving dog mounted for reciprocationupon each runner of the sled, or upon some other portion of the sledframe, and provided with means for guiding its movement relatively tothe tread portion of the sled runner. In the form shown in the drawings,this driving dog consists of a connecting rod, 1, having at one end aspur, 1 and a guide roller, 2, and being connected at the other end withan actuating hand-lever 3. Although shown as a hand-power device,certain distinguishing features of this invention would be alsoapplicable to a power driven sled.

For controlling the movement of the spurcarrying end of the connectingrod, 1, there is provided a cam track, 4, for the roller, 3, comprisingan inclosing rail 4*, and a guide rail 4, within the inclosure formed bythe rail 4, and having upper and lower guide surfaces 4 and 4respectively. Preferably, these rail members are formed as laterallyprojecting flanges of the base portion 4 of a single casting 4, which issecured in any suitable manner to the inner face of the sled runner A.

It will be understood that the device is made in duplicate, and appliedto a runner on each side of the sled, in order that the action may bebalanced, and that the steering may be in no way interfered with.

The lower surface, 4 of the guide rail is Specification of LettersPatent.

Application filed January 12, 1911.

Serial No. 602,186.

so positioned relatively to the tread portion B of the runner A as tocontact with the roller, 2, and to bring the point of the spur, 1 belowthe tread into engagement with the iced roadway. This engagement ismaintained throughout that portion of the working stroke for which theguide surface 4 is parallel with the tread B, the upwardly sloping endsof the said surface 4 serving respectively to effect such engagement andto relieve the spur therefrom. For facilitating this relief of the spurfrom the ice at the end of the working stroke, and for insuring that thereturn stroke shall be begun along the upper track furnished by theguide surface 4, the lower rear portion of the outer guide rail 4 iscomposed of the separate element 4 pivotally mounted upon the base ofthe track casting for swinging upward toward the rear end of theguiderail 4*. A spring 5 is shown positioned to cause this movement, andthe element 4 will normally stand abutting the guide-rail 4, except whenforced away from it during the passage of the roller 2. The guard rail 4is formed with a stop lip 4 to limit the opening movement of the element4 At the end of the return stroke, the roller 2 will follow the curve ofthe outer guard-rail, 4, downward, and, as above mentioned, will beengaged by the sloped end of the guide-surface 4 as the working strokecommences.

Since the action of the device is intermit tent, it would be necessaryin traveling uphill, that some means be'provicled to prevent the slidefrom slipping backward during the non-working stroke of thedog, 1. Forthis purpose, the sprags 6 are shown pivoted to the sled runner near itstread, and so sloped as to merely trail during the forward movement ofthe runner, but so as to dig into the ice or road surface immediatelyupon the commencement of any rearward movement.

It is obvious that the parts of the device might be variously designedwith a view to the retention of the roller, 2, upon its track guides;but, as shown, the roller is made with a curved or crowned tread, 2 andthe guide surfaces of the track, 4, are grooved to fit the curve of thetread and thus laterally retain the roller.

In Fig. 2, the connecting rod, 1, is shown attached to the operatinglever, 3, at the point, 3*, above the fulcrum, 3", but to adapt PatentedFeb. 6, 1912.

the device to be operated either by a push or by a pull during theworking stroke, in accordance'with' the preference of difierentoperators, these points, 3 and 3 are made interchangeable. When theconnecting rod as made curved, as shown, this necessitates separating itfor reversal of the curve when it is linked to the lever at the lowerpoint, 3", and for this reason, the forward portion, 1', is shown boltedto the remainder of the rod, 1. An auxiliary fulcrum block, 7, ismounted upon the sled in position to carry the lever by a pivot-pinthrough the point, 3

When this device is applied to a double handles, 3, of each lever may betubular,

anda connecting rod, 8, may then be insertc ed through them both whensimultaneous operation is desired for straight line travel.

1. An ice motor comprising a runner adapted for sliding upon a roadsurface; a rod provided at one end with a spur and a roller; a camtrackfor the roller comprising an upper and a lower track, said uppertrack being positioned for guiding the spur out of engagement with theroad surface, said lower track being positioned for guiding the spur inengagement with the road surface; a curved track connecting the forwardends of the upper and lower tracks, and sloped downward from' itsconnection with the lower track; acurved track connecting the rear endsof the lower and upper tracks, the lower portion of said curved trackbeing pivoted for swinging upward and forward toward the upper track; aspring positioned to cause such swinging movement of the pivoted track,and means for reciprocating the dog.

2. An ice motor comprising a runner adapted for sliding upon a roadsurface, a dog mounted for reciprocation upon the runner; a cam trackfor guiding the dog in engagement with the road surface during itsmovement in one direction, and for guiding said dog out ofengagementwith the road surface during its movement in the opposite direction; anactuating lever; a rod operatively connecting the dog with said lever,the lever being fulcrumed at its lower end, the rod being disengageablyconnected to the lever at a point between the ends of the lever, and anauxiliary fulcrum positioned for supporting the lever at said pointbetween its ends, the fulcrumed end of the lever being adapted forconnection with the rod.

8. In combination with a sled having a pair of runners adapted forsliding upon a road surface; a dog mounted for reciprocation upon eachrunner; cam tracks for guiding the dogs in engagement with the roadsurface during their movement in one direction, and for guiding saiddogs out of engagement with the road surface during their movement inthe opposite direction; an actuating lever operatively connected witheach dog, said levers being exactly similar and mounted for movement inparallel planes; a tubular handle on each lever, and a rod adapted to beinserted through said handles for connecting them for simultaneousoperation.

In testimony whereof, I have hereunto set my hand at Chicago, Illinois,this 6th day of January, A. D., 1911.

ALBERT GRUB.

WVitnesses ROBT. N. BURTON, PAUL J. GATHMANN.

Gopies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

7 Washington, D. C.

